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R Programming Quiz 19

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The Quiz is about R Programming Quiz with Answers. There are 20 multiple-choice questions covering different topics related to R Language Programming. Let us start with the R Programming Quiz now.

Online R Programming Quiz with Answers

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1. Assume the array books_array contains 6 elements. The array has three rows and two columns and appears as follows:

     [,1]              [,2]
[1,] "It"              "Dr. Sleep"
[2,] "Misery"          "Carrie"
[3,] "The Shining"     "The Mist"

Which of the following commands will return “The Shining”?

 
 
 
 

2. How many elements will be in vector $b$, if b <- 10:15

 
 
 
 

3. In R, which command will output the data from the Nile built-in data set?

 
 
 
 

4. In R, variables are typically assigned using <-, but they can also be assigned using which of the following symbols?

 
 
 
 

5. In R, which command removes a variable from memory?

 
 
 
 

6. In R, assume you have a vector named “age,” and each element in the vector is the age of one person in a group. Which command must you use to reorder the ages from youngest to oldest?

 
 
 
 

7. In R, assume you have a vector named “age,” and each element in the vector is the age of one person in a group. The vector has the following content: 24 32 46 19. What will be the result if you issue the age[-2] command?

 
 
 
 

8. In R, which command should you use to insert a new row into a data frame?

 
 
 
 

9. After installing and calling the httr library in R, which method should you use to update a resource?

 
 
 
 

10. In R, what is the result of the function as.integer(3.3)?

 
 
 
 

11. What is the main reason for using the R language?

 
 
 
 

12. Which command in R would return the following character vector? “Imdad” “Usman” “Ali” “Amir”

 
 
 
 

13. All columns in a matrix must have the

 
 
 
 

14. In R, what is the result of the function as.numeric(TRUE)?

 
 
 
 

15. In R, assume a character vector called “names” has the following contents:

“Harry” “Jimmy” “Tammy”

Which command would return the following logical vector?

FALSE TRUE FALSE

 
 
 
 

16. To perform a one-way Analysis of variance, one can use a function

 
 
 
 

17. What is the first step you must take before you can read an Excel spreadsheet in R?

 
 
 
 

18. For a matrix $X$ of order $n\times p$ and a vector $Y$ of order $n\times 1$, one can find regression coefficients using

 
 
 
 

19. Assume that the function add is defined as follows:

add <- function(x,y) {
(x + y)
return (x - y)
temp <<- (x * y)
return (x / y)
}

What will be the output if you issue the command add(10,5)?

 
 
 
 

20. In R language, which command returns the last six elements of a data object such as a data frame?

 
 
 
 

Online R Programming Quiz with Answers

  • What is the main reason for using the R language?
  • In R, what is the result of the function as.numeric(TRUE)?
  • In R, variables are typically assigned using <-, but they can also be assigned using which of the following symbols?
  • Which command in R would return the following character vector? “Imdad” “Usman” “Ali” “Amir”
  • In R, assume you have a vector named “age,” and each element in the vector is the age of one person in a group. The vector has the following content: 24 32 46 19. What will be the result if you issue the age[-2] command?
  • Assume the array books_array contains 6 elements. The array has three rows and two columns and appears as follows:

    [,1]              [,2]
[1,] “It”              “Dr. Sleep”
[2,] “Misery”          “Carrie”
[3,] “The Shining”   “The Mist”

Which of the following commands will return “The Shining”?

  • In R language, which command returns the last six elements of a data object such as a data frame?
  • Assume that the function add is defined as follows:
    add <- function(x,y) {
    (x + y)
    return (x – y)
    temp <<- (x * y)
    return (x / y)
    }
    What will be the output if you issue the command add(10,5)?
  • What is the first step you must take before you can read an Excel spreadsheet in R?
  • After installing and calling the httr library in R, which method should you use to update a resource?
  • In R, what is the result of the function as.integer(3.3)?
  • In R, which command removes a variable from memory?
  • In R, assume a character vector called “names” has the following contents: “Harry” “Jimmy” “Tammy” Which command would return the following logical vector? FALSE TRUE FALSE
  • In R, assume you have a vector named “age,” and each element in the vector is the age of one person in a group. Which command must you use to reorder the ages from youngest to oldest?
  • In R, which command will output the data from the Nile built-in data set?
  • In R, which command should you use to insert a new row into a data frame?
  • To perform a one-way Analysis of variance, one can use a function
  • How many elements will be in vector $b$, if b <- 10:15
  • All columns in a matrix must have the
  • For a matrix $X$ of order $n\times p$ and a vector $Y$ of order $n\times 1$, one can find regression coefficients using
R Programming Quiz with Answrs

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R Programming Quiz Questions Answers 18

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This post is about “R Programming Quiz Questions Answers”. There are 20 multiple-choice questions from R programming covering topics related to the output of different R commands, R console, matrices, data frames, factors, vectors, R objects, and different operations on R objects. Let us start with R Programming Quiz Questions Answers.

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R FAQS R Programming Quiz Questions and Answers

R Programming Quiz Questions Answers

  • The output of seq(10, 1, -2) is
  • What will be the output of the following lines of code? x <- 31 if (x %% 2 == 0){ print(“X is even”) }else { print(“X is odd”) }
  • What would be the output of 1:5 + 5:1.
  • What will be the output of the following x <- vector(“numeric”, length = 10); print(x)
  • What would be the output of the following code? x <- 1:4 y <- 6:9 z <- x + y print(z)
  • What will be the output of the following X <- factor(c(“yes”, “yes”, “yes”, “no”, “yes”, “no”, “no”) table(X)
  • The output of the seq(1, 10, 2) is
  • What will be the output of the following code X <- factor(c(“m”, “m”, “m”, “f”, “m”, “f”, “f”) table(X)
  • What is the output of 1:4 + 4:1
  • R console is a tool that is used to write (insert) standard
  • The following command will find the 60th percentile for the variable $disp$
  • The multiplication of two matrices $A$ and $B$ can be performed in R using the operator
  • Which command will create a matrix of the first 9 numbers in 3 rows and 3 columns?
  • When we compare two vectors element by element the resultant outcome is a
  • Which of the following function can be used to create a vector having repeated values
  • The Vectors, data frames, or matrices containing decimal values can be converted to integers using
  • What is the data type of vector $a$ if a <- c(1, “m”, FALSE)
  • All columns in a matrix must have the
  • To perform one-way Analysis of variance, one can use function
  • In R, object name cannot start with
R Programming Quiz Questions and Answers

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Best MCQs Graph Plotting in R 17

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The post is about MCQs Graph Plotting in R Language. There are 20 multiple-choice questions. The quiz covers the topics related to graphics devices in R Language, base and lattice graphics systems in R, the ggplot2 function, and parameters of different plot functions. Let us start with MCQs Graph Plotting in R Language.

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MCQs Graph Plotting in R

  • Which of the following is an example of a valid graphics device in R?
  • Which of the following is the example of a vector graphics device in R?
  • Bitmapped file formats can be most useful for
  • Which of the following functions is typically used to add elements to a plot in the base graphics system?
  • Which function opens the screen graphics device on Windows?
  • What does the ‘pch’ option to par() control?
  • If I want to save a plot to a PDF file, which of the following is the correct way of doing that
  • Which function opens the screen graphics device for the Mac?
  • What does the gg in ggplot2 stand for?
  • Under the lattice graphics system, what do the primary plotting functions like xyplot() and bwplot() return?
  • Which of the following is a basic workhorse function of ggplot2?
  • Which types of the plot does qplot plot?
  • Transparency is determined by which parameter of the rgb function?
  • Which of the following is an R package that provides color palettes for sequential, categorical, and diverging data?
  • The following code does NOT result in a plot appearing on the screen device.
    library(lattice)
    library(datasets)
    data(airquality)
    p <- xyplot(Ozone ~ Wind | factor(Month), data = airquality)
    Which of the following is an explanation for why no plot appears?
  • In the lattice system, which of the following functions can be used to finely control the appearance of all lattice plots?
  • What is ggplot2 an implementation of?
  • What is a geom in the ggplot2 system?
  • When I run the following code I get an error: I was expecting a scatterplot of ‘votes’ and ‘rating’ to appear. What’s the problem?
  • The following code creates a scatterplot of ‘votes’ and ‘rating’ from the movies dataset in the ggplot2 package. After loading the ggplot2 package with the library() function, I can run qplot(votes, rating, data = movies)
    How can I modify the code above to add a smoother to the scatterplot?
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